Could be, it does have a resemblance to lower-grade Indian schist-hosted material. Some of these star though they generally don't produce valuable gems.
Estimating a sphere of radius 2.75" (5.5" diameter - the average of 7 and 4), would be a radius of about 7cm.
the volume of a sphere is (4/3)Pi r^3, so we get a volume of 1,436 cc's. Sapphire is about 4 gm/cc, so this would be 20 carats/cc or approx 28,735 carats.
You have between 1/3 and 1/2 of that. BUT it isn't a sphere and with another dimension it might be smaller. And it might not be "pure". Mica doesn't weigh much.
quarts is 2.71 or 13.5 carats/gm or 19,467 carats under the same calculation.
Best guess from this: I don't know. . But it was fun to try.
Oh yeah, I'm in agreement with you on that--it's not monocrystalline so you aren't getting any good novelty-size stars out of it, and smaller Indian star rough is inexpensive, lets you cut a variety of colors and since it comes as crystals you don't need to work hard to find the c-axis or to establish the outline of the cab.
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